I think it might be useful to compile a list of sample libraries that LinuxSampler can load. In practice that means libraries in the Gigasampler/Gigastudio format and raw WAVE or AIFF samples to be assembled with Gigedit. Please let me know of additional libraries so that we can extend this list.

Commercial

Art VistaArt Vista, run by Hans Adamson, has a Malmsjö Acoustic Grand and Cool Vibes library in Gigastudio format.

Creative GuildCreative Guild have some sample libraries in Gigastudio format for sale.

Impact: SteelThis library was performed, recorded, designed, and produced by Wilbert Roget, II: I wanted to fill a gap I'd found in popular commercial sound libraries - several other products have metal hits and "found" percussion, but none are extensively sampled and usable as individual instruments. My goal therefore was to create a unique, detailed and playable library with the same amount of multisampled detail one would expect from a high end percussion bank. Available in Kontakt 2, Kontakt 1, Gigastudio 3 and Halion 3 formats.

Kirk Hunter StudiosAmong L.A. violinist and sample developer Kirk Hunter's excellent orchestra libraries only his Emerald Orchestra is still available in Gigastudio format, the rest for Kontakt and EXS24 (the latter can successfully be translated into Gigastudio format).

Notre Dame de Budapest Pipe Organ SamplesNotre Dame de Budapest Pipe Organ Samples is an organ library created from the pipe organs of two Hungarian cathedrals: the Notre Dame de Buda (The Church of the Blessed Virgin, commonly known as Matthias-Church), which is the biggest organ in Hungary with a 99-stop Rieger-Kloss organ; and the Notre Dame de Kispest (Church of Our Lady, Kispest), which has a 38-stop Varga organ. The library is available in a Gigastudio 2 and a Gigastudio 3 version.

ProjectSAMProjectSAM, created by the dutch trio Maarten Spruijt, Vincent Beijer and Marco Deegenaars, is currently most renowned for their True Strike and True Strike 2 multi-format percussion libraries but has also developed a brass series and an organ library.

RealsamplesRealsamples offer you a variety of multisampled stringed instrument in multiformat at affordable prices. Especially take a look at the "Edition Beurmann" a series of instruments out of the renowned historical keyboard instrument collection of Professor Andreas E. Beurmann.

SampleTekkSampleTekk, a Swedish sample developer run by Per “Worra” Larsson, is famous for their multi-format keyboard libraries and distribution of libraries as downloads.

SCARBEESCARBEE, run by danish bass player Thomas Hansen Skarbye, still has Classic Electric Piano, Scarbee Edgy Electric Piano, J-Slap and J-Fingered bass available in Gigastudio format.

Westgate StudiosWestgate Studios are currently developing and releasing their Modular Series of orchestral instruments in the Gigastudio 3 and Kontakt format. The series is organized by the various instrument families and let you buy them separately. Westgate offer smaller slimed down versions as downloads at lower price that can be upgraded to the full DVD version (the idea is that you can buy the download to play with while you wait for your DVD to arrive, the total cost is the same).

Vienna Symphonic LibraryThere are still some VSL libraries available in Gigastudio format from various sellers here and there (products with "VSL" in their name and not "VI"), despite being discontinued by VSL and replaced by the VI (Vienna Instrument) line.

Free and freebies

The Berklee College of Music Sampling ArchiveOver 8.5GB of FREE Samples – Sound Effects, Loops, Grooves, Drums, Voices and Instruments – for The Children of the World. This huge and continuously expanding collection of new and original samples have been donated to Dr. Richard Boulanger @ cSounds.com specifically to support the OLPC developers, students and XO users. They are free and will be available under a CC-BY license for downloading and use in your music and activities. Each of the 6500+ samples is 16-bit, WAV, Mono, normalized to -3dB, and provided at 3 sample rates - 44.1K, 22.5K and 16K.

The Blanchet 1720A virtual harpsichord copied after a 18th century French instrument by Blanchet. It has one manual, two 8' stops, plus a lute stop.

BOLDER SoundsBOLDER Sounds has six free sample libraries with the kind of sound you won't find anywhere else.

G-Town Church Sampling ProjectRecorded in his local church in Grebbestad, Sweden by music producer Tobias Marberger, this set of music samples should be invaluable to amateur and professional musicians alike. For this LegalTorrents version of the hard-to-find files, Tobias Marberger has officially Creative Commons-licensed the samples with a Sampling+ license. The multitude of samples include percussion of many different kinds (anvil, snare, wood sticks, hihat, brushplate, bongos), as well as piano, organ, mandolin, glockenspiel, flute, and many other high quality recordings.

HammerSoundA SoundFont library database containing SoundFonts submitted by people from all over the world. Of varying quality, but really handy starting point when you looking for a sample or instrument you're missing (e.g. use Translator Free to extract or convert the SoundFonts).

Mats Helgesson's Maestro Concert Grand v2Mats Helgesson is the man who, in 2003, gave to the world the best free piano bank, the famous Maestro Concert Grand v2. The Maestro Concert Grand v2 is a big giga bank using 452 stereo samples of a concert piano, a Yamaha CF3, recorded with two Neumann KM84 microphones, disposed in X/Y, with 5 velocity layers. The archive weighs 354 MB, and, decompressed, this soundbank weighs 985 MB!

NaturalstudioNaturalstudio have released several multi-sampled drum kits and the latest edition ns_kit7free is available in Gigastudio format. Apparently this drum kit and Naturalstudio is officially dead.

Orgue de SalonA small house organ, 250 pipes, 5 real stops on two manuals (plus a coupled keyboard), built in 1988.

PhilharmoniaSingle note, phrases, articulations and percussion samples. Not in Gigastudio format but as mp3.

ProjectSAMProjectSAM usually have a set of Gigastudio freebies as demos.

The Tic Tok MenSample sets come in two formats. As zip packages with each wav file separate or as a Gigasampler sample set: "Moogdrums One" and "RetroDrums One".

Total Harmonic DistortionThis is a tempo-based sample library of synthetic loops created and processed using a modular synthesizer. There are nearly 3GB of samples in 10 tempo groups (72bpm-144bpm) ranging from distorted, pulsing to ambient, soothing. A zip package of wav files.

University of Iowa: Musical Instrument SamplesThe University of Iowa Musical Instrument Samples were created by Lawrence Fritts, Director of the Electronic Music Studios and Associate Professor of Composition at the University of Iowa in 1997. The instruments were recorded in the Anechoic Chamber in the Wendell Johnson Speech and Hearing Center at The University of Iowa. The only non-anechoic instrument is the piano, which was recorded in a small faculty teaching studio. All samples are in mono, 16 bit, 44.1 kHz, AIFF format. The exception is the piano, which is recorded in stereo.

Just want to bump this topic because I just added G-Town Church Sampling Project to the list of free libraries. It was difficult to get hold of for a while when the original site was down but is now distributed as a torrent. If you don't have it already: Go get it now! You don't wanna miss it! (Danny Elfman used the "Stomp" patch on the soundtrack to Hulk.)

A great suggestion. This is a good, consistent, reliable library, that works, and sounds good. After the first demo, which i'm working on at the moment, i'm going to revisit gtown, and see what i can cook up.

If anyone wants a good, free, library that sounds like a commercial offering, this is definitely on the list.

I'm going to contribute a first demo soon using the Gtown full-stops organ. Just need to freshen up my memory, was a couple of years since I last played the piece except for the first couple of bars (guess which piece ).

aurus, thanks for the link!how does this piano sound ? Is it currently the best sounding large free piano sample ?

I have seen that on that webpage there are other samples too like harpsichord, organ etc,but not in GIG format (kontakt,sf2). Could someone ask the authors and ask if we can turn it into GIG files ?It is nice see that finally more higher quality free samples are being released.